Postmenopausal women who take estrogen for years are more likely to experience incontinence than those on the hormone for a shorter time or not at all, a new study finds. Of 167 women surveyed in the early 1990s and again in 2004, those who had taken estrogen for five years or more were three to four times more likely to report bladder control problems in the second survey than women who had not taken estrogen or took it for less than five years.